RankSystem exports: call to server resource not running (tactics) [string "?"]

[xJulianGilx]

idownload this ransks system and i have bugs please help me solve it here> https://community.multitheftauto.com/index.php?p=resources&s=details&id=15543 

and these are the errors that appear in the console

ERROR: xX_RankSystem \ server.Lua: 127: exports: call to server resource not running (tactics) [string "?"]
ERROR: xX_RankSystem \ server.Lua: 127: Attempt to index a null value

 

addEventHandler("onPlayerDamage", root,
function(attacker, _, _, loss)
    if exports.tactics:getRoundMapInfo()["modename"] ~= "lobby" then  <línea 127>
        if attacker and getElementType(attacker) == "player" and attacker ~= source then
            local account = getPlayerAccount(attacker)
            if account and not isGuestAccount(account) then
                local accountName = getAccountName(account)
                temporaryTable[accountName]["total_hits"] = temporaryTable[accountName]["total_hits"] + 1
                temporaryTable[accountName]["total_dmg"] = temporaryTable[accountName]["total_dmg"] + math.ceil(loss)
                local assistsTable = getElementData(source, "assists") or {}
                if assistsTable[accountName] then
                    assistsTable[accountName] = assistsTable[accountName] + math.ceil(loss)
                else
                    assistsTable[accountName] = math.ceil(loss)
                end
                setElementData(source, "assists", assistsTable, false)
                if isTimer(assistsTimer[source]) then 
                    resetTimer(assistsTimer[source])
                else
                    assistsTimer[source] = setTimer(function(source)
                        assistsTimer[source] = nil
                        if isElement(source) then
                            setElementData(source, "assists", {}, false)
                        end
                    end, 10000, 1, source)
                end
            end
        end
    end
end)

Thank you for viewing my message, I would appreciate responses if you can

[Ahmed Ly]

Rename gamemode "tactics-12-r20"   to tactics